A lot of folks do not realize that the majority of all drinking water supplies serving the Bay Area will be out of commission when the Hayward Fault ruptures the Hetch-Hetchy main water conduit through the Diablo Range to the San Mateo terminus. While California's OES and FEMA will be working feverishly to get water services back online - it is a safe guess that it will be a while before they succeed.
If you decide to store your water in large 5 gallon containers like the ones from bottled water service companies, you may want to get an inexpensive battery operated water pump
(make sure to get extra batteries of the correct size and put them in your EQ Prep Kit).
More Earthquake Prep Resources
Updating your Home Eq Preparations - Must Have Items
Water Storage Ideas